28415040 has 56 divisors (see below), whose sum is σ = 90220800. Its totient is φ = 7577088.

The previous prime is 28415039. The next prime is 28415047. The reversal of 28415040 is 4051482.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28415040.

It is not an unprimeable number, because it can be changed into a prime (28415047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13840 + ... + 15759.

Almost surely, 2^28415040 is an apocalyptic number.

28415040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28415040 is an abundant number, since it is smaller than the sum of its proper divisors (61805760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28415040 is a wasteful number, since it uses less digits than its factorization.

28415040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29619 (or 29609 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28415040 is about 5330.5759538722. The cubic root of 28415040 is about 305.1519085614.

The spelling of 28415040 in words is "twenty-eight million, four hundred fifteen thousand, forty".